RPC: Decide on exact cancellation semantics, adjust mutexes accordingly
See discussion at !1092 (comment 2894407) :
We need to decide whether it's okay if a call to cancel() returns before the request is cancelled (or not).
See discussion at !1092 (comment 2894407) :
We need to decide whether it's okay if a call to cancel() returns before the request is cancelled (or not).